ACARICIDAL POTENTIAL AND REPRODUCTIVE IMPACT OF MARINE ALGA, Laurencia obtusa COMPOUNDS AGAINST Tetranychus urticae (Koch) and, Panonychus ulmi (Koch) | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 2, Volume 23, Issue 2, July 2009, Page 12-21 PDF (465.47 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2009.197054 | ||||
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| Authors | ||||
| Eman S. Swelam; Samia EL-Kabbany | ||||
| Department of Economic Entomology & Pesticides, Faculty of Agriculture, Cairo University, Egypt | ||||
| Abstract | ||||
| The red alga Laurencia obtusa (Huds), has long been known as a reliable source of secondary metabolites. The toxicity of dichloromethane extract and its fractions against Tetranychus urticae (Koch) and Panonychus ulmi (Koch) spider mites was assessed. Bioassay efficacy guided to isolate two halogenated terpene and one nonterpenoid compounds. The latent effects of three compounds were also investigated. The results showed that the crude extract and its three fractions were active against both mites. It was found that T. urticae was more sensitive than P. ulmi to the isolated fractions of L. obtusa and to the reference acaricide dicofol. The number of progeny and the longevity of the exposed adults of both mites were used as criteria for the deleterious effects of the fractions .It was observed that the three fractions showed highly effect on the hatchability of eggs. Significant variations were recorded on the reduction in total numbers of eggs/female against the two mites. | ||||
| Keywords | ||||
| Marine alga; Laurencia obtusa; bioactivities; mites | ||||
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